Switch device

Abstract

A switch device that includes a switch, a casing, side wall portions extending in a first direction from the casing, front and back wall portions extending in the first direction from the casing, a dust-proof portion extending from the back wall portion, and an operation knob including an upper surface portion swingable in a second direction perpendicular to the first direction and a third direction opposite to the second direction and covers the dust-proof portion, and a back surface portion extending in a fourth direction opposite to the first direction from the back end of the upper surface portion and faces a part of the dust-proof portion, wherein the side wall portions, the front wall portion, and the back wall portion form a substantially rectangular shape, the side wall portions, the front wall portion, and the dust-proof portion form another substantially rectangular shape greater than the substantially rectangular shape.

What is claimed is: 
     
       1. A switch device comprising:
 a switch; 
 a casing accommodating the switch; 
 a pair of side wall portions extending in a first direction from the casing; 
 a front wall portion extending in the first direction from the casing; 
 a back wall portion extending in the first direction from the casing; 
 a dust-proof portion extending from the back wall portion; and 
 an operation knob including
 an upper surface portion which is mounted on the casing so as to be swingable in a second direction perpendicular to the first direction and a third direction opposite to the second direction and covers the dust-proof portion along the first direction, and 
 a back surface portion which extends in a fourth direction opposite to the first direction from the back end of the upper surface portion and faces at least a part of the dust-proof portion, 
 
 wherein, in a plan view observed in the first direction, the side wall portions, the front wall portion, and the back wall portion form a substantially rectangular shape, 
 wherein the side wall portions, the front wall portion, and the dust-proof portion form a substantially rectangular shape, and 
 wherein the substantially rectangular shape formed by the side wall portions, the front wall portion, and the dust-proof portion is greater than the substantially rectangular shape formed by the side wall portions, the front wall portion, and the back wall portion. 
 
     
     
       2. The switch device according to  claim 1 ,
 wherein the dust-proof portion is formed by a first dust-proof portion and a second dust-proof portion, 
 wherein the first dust proof-portion is provided to extend in the second direction from the back wall portion, and 
 wherein the second dust proof portion is provided to extend in the first direction from the first dust-proof portion. 
 
     
     
       3. The switch device according to  claim 2 ,
 wherein the first dust-proof portion extends in parallel with the second direction from the back wall portion. 
 
     
     
       4. The switch device according to  claim 2 ,
 wherein a portion of a back surface of the second dust-proof portion has a shape that matches a trajectory of the back surface portion while the operation knob swings, 
 wherein the first dust-proof portion extends with a gradient relative to the second direction from the back wall portion. 
 
     
     
       5. The switch device according to  claim 2 , the switch further comprising:
 a third dust-proof portion which is provided to extend in the first direction from the first dust-proof portion and disposed closer to the back wall portion than the second dust-proof portion, 
 wherein a dust collecting portion is formed by the first dust-proof portion, the second dust-proof portion, and the third dust-proof portion. 
 
     
     
       6. The switch device according to  claim 1 ,
 wherein the side wall portion is disposed to cover side ends of the first dust-proof portion, the second dust-proof portion, the front wall portion, and the back wall portion  63 . 
 
     
     
       7. The switch device according to  claim 2 ,
 wherein a part of a surface of the second dust-proof portion on a side of the second direction has a shape along a trajectory of the back surface portion during swing of the operation knob. 
 
     
     
       8. The switch device according to  claim 2 ,
 wherein a part of a surface of the second dust-proof portion on a side of the second direction has a shape along the back surface portion after the operation knob is moved to an end portion of the second direction. 
 
     
     
       9. The switch device according to  claim 1 ,
 wherein the first direction is an upward direction.